HP Officejet Pro 85000 Wireless printer won't print blue anymore

I changed the blue cartridge twice, and the screen of my printer indicates that the blue cartridge is indeed full.

However, all pages printed come without the blue color.

I've ran the "cleaning heads" programme 3 times in a row, but that doesn't fix the issue.

Can something (dried print) be clogging the blue head?

Does the head has to be cleaned manually?

How do I do this?